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学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语

Five years ago, I had a small dog. He was cute and liked eating meat. His name was Dudu. He could open the door when I came back. He could jump to the sofa to watch TV. He could catch the balls when I threw to him. He could hear us. He came back when we called him.

1.The dog’s name was Dudu. (     )
2.The dog could open the door. (     )
3.The dog couldn’t catch the balls. (     )
4.The dog couldn’t jump to the sofa. (     )
5.The dog was very cute and clever. (     )
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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